Spatially-dependent sensitivity of superconducting meanders as single-photon detectors
arXiv:1206.4298 · doi:10.1063/1.4731627
Abstract
The photo-response of a thin current-carrying superconducting stripe with a 90-degree turn is studied within the time-dependent Ginzburg-Landau theory. We show that the photon acting near the inner corner (where the current density is maximal due to the current crowding [J. R. Clem and K. K. Berggren, Phys. Rev. B {\bf 84}, 174510 (2011)]) triggers the nucleation of superconducting vortices at currents much smaller than the expected critical one, but {\it does not} bring the system to a higher resistive state and thus remains undetected. The transition to the resistive state occurs only when the photon hits the stripe away from the corner due to there uniform current distribution across the sample, and dissipation is due to the nucleation of a kinematic vortex-antivortex pair near the photon incidence. We propose strategies to account for this problem in the measurements.
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- The effect of magnetic field on the intrinsic detection efficiency of superconducting single-photon detectors
- Dynamical regimes of ultrafast kinematic vortices in the resistive state of mesoscopic superconductors
- Differences in the effects of turns and constrictions on the resistive response in current-biased superconducting wire after single photon absorption
- Temperature and phase dynamics in superconducting weak-link
- Vortex dynamics induced by scanning SQUID susceptometry
- Profile and Crowding of Currents in Mesoscopic Superconductors with an Array of Antidots